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Ego (noun)
The self, especially with a sense of self-importance.
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Ego (noun)
The most central part of the mind, which mediates with one’s surroundings.
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Superego (noun)
The part of the mind that acts as a self-critical conscience, reflecting social standards that have been learnt.
Wiktionary
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Ego (noun)
a person’s sense of self-esteem or self-importance
“he needed a boost to his ego”
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Ego (noun)
the part of the mind that mediates between the conscious and the unconscious and is responsible for reality testing and a sense of personal identity.
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Ego (noun)
(in metaphysics) a conscious thinking subject.
Oxford Dictionary